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铝阳极氧化多孔膜制备及Eu3+组装 总被引:1,自引:1,他引:0
在草酸体系中,采用二次阳极氧化法可制备大面积有序铝阳极氧化多孔膜(AAO),用X射线粉末衍射(XRD)仪进行物相分析,利用扫描电子显微镜(SEM)表征多孔膜的形貌。研究表明,低温条件下制备的多孔膜孔径大小分布均匀,有序性好。微孔在膜的表面沿二维空间规则排列,具有一定的六方对称准周期性。孔道相互平行且与铝基底垂直。低温条件下,草酸体系中电解获得的AAO膜以无定形结构存在,经过800℃高温退火后转化为γ-Al2O3。通过水热反应法,获得了Eu^3 的铝阳极氧化多孔膜组装体(AAO:Eu^3 ),研究了组装体系的光谱特性。结果表明,这种方法制备的发光材料具有非常高的组装浓度,其发光具有很高的色纯度。 相似文献
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利用非对称磁镜场电子回旋共振等离子体产生的氧回旋离子束刻蚀了化学气相沉积金刚石膜,研究了工作气压和磁电加热电压对金刚石样品附近的离子温度和密度的影响,并分析了金刚石膜的刻蚀和机械抛光效果。结果表明:当工作气压为0.03 Pa,磁电加热电压为200 V时,离子温度和密度最大,分别为7.38 eV和 23.81010 cm-3 。在此优化条件下刻蚀金刚石膜4 h后,其表面粗糙度由刻蚀前的3.525 m降为2.512 m,机械抛光15 min后,表面粗糙度降低为0.517 m,即金刚石膜经离子束刻蚀后可显著提高机械抛光效率。 相似文献
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根据多孔阳极氧化铝(AAO)薄膜的实验透射谱(200—2500nm),采用极值包络线算法确定其光学常数,并由此较精确地计算出AAO薄膜样品在该波段的光学常数.结果表明,多孔氧化铝薄膜表现出直接带隙(能隙约4.5eV)半导体的光学特性,且其光学常数与制样中的重要工艺参数阳极氧化电压有显著的相关性,即随阳极氧化电压的增加,AAO薄膜的厚度、折射率和光学能隙变大,消光系数减小.同时,计算得到的薄膜厚度与实测值相吻合,则说明计算结果和实验值是自洽的.
关键词:
薄膜光学
光学常数
多孔阳极氧化铝
阳极氧化电压 相似文献
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S. N. Terekhov P. Mojzes S. M. Kachan N. I. Mukhurov S. P. Zhvavyi A. Yu. Panarin I. A. Khodasevich V. A. Orlovich A. Thorel F. Grillon P.‐Y. Turpin 《Journal of Raman spectroscopy : JRS》2011,42(1):12-20
Three types of Ag‐coated arrays from porous anodic aluminum oxide (AAO) were prepared and studied as substrates for surface‐enhanced Raman scattering (SERS). They were compared with Ag‐coated porous silicon (PSi) samples. AAO‐based substrates were prepared by the vapor deposition of silver directly onto the surface of porous AAO with different morphologies of the pores, whereas SERS‐active island films on the PSi were prepared by immersion plating. The resulting metallic nanostructures were characterized by UV‐vis absorption spectroscopy and scanning electron microscopy (SEM). Thermal evaporation leads to the formation of granular arrays of Ag nanoparticles on the surface of AAO. SERS activity of the substrates was tested using water‐soluble cationic Zn(II)‐tetrakis (4‐N‐methylpyridyl) porphyrin (ZnTMPyP4) as a probe molecule. The results indicate that all AAO‐based substrates studied here exhibit some degree of SERS activity. Noteworthy, for excitation at 532 nm, signals from AAO‐based substrates were comparable with those from the PSi‐based ones, whereas for 441.6 nm excitation they were about twice higher. The strongest SERS‐enhancement at 441.6 nm excitationwas provided by the AAO substrates with silver deposited on the monolith (originally nonporous) side of AAO. Preferential SERS‐enhancement of the bands ascribed to the vibrations of the N‐methylpyridinium group of ZnTMPyP4 when going to blue excitation was found. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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对未经化学抛光处理的Al进行阳极氧化得到阳极氧化铝模板,发现Al表面形成了条纹与多孔阵列共存的自组织结构,用原子力显微镜对这种结构进行了研究.借助Brusselator模型对条纹的形成机理进行了讨论,认为条纹图案是Al表面氧化层/电解液界面的Al2O3在整个反应过程中的生成和溶解两个过程相互竞争导致的,只有在特定的反应条件才会出现高度有序的结构.
关键词:
氧化铝模板(AAO)
原子力显微镜(AFM)
自组织条纹
Brusselator模型 相似文献
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Mass analyzed highly charged ion beams of energy ranging from a few keV to a few MeV plays an important role in various aspects
of research in modern physics. In this paper a unique low energy ion beam facility (LEIBF) set up at Nuclear Science Centre
(NSC) for providing low and medium energy multiply charged ion beams ranging from a few keV to a few MeV for research in materials
sciences, atomic and molecular physics is described. One of the important features of this facility is the availability of
relatively large currents of multiply charged positive ions from an electron cyclotron resonance (ECR) source placed entirely
on a high voltage platform. All the electronic and vacuum systems related to the ECR source including 10 GHz ultra high frequency
(UHF) transmitter, high voltage power supplies for extractor and Einzel lens are placed on a high voltage platform. All the
equipments are controlled using a personal computer at ground potential through optical fibers for high voltage isolation.
Some of the experimental facilities available are also described. 相似文献
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Ultrasound has been proven to enhance the mass transfer process and impact the fabrication of anodic aluminum oxide (AAO). However, the different effects of ultrasound propagating in different media make the specific target and process of ultrasound in AAO remain unclear, and the effects of ultrasound on AAO reported in previous studies are contradictory. These uncertainties have greatly limited the application of ultrasonic-assisted anodization (UAA) in practice. In this study, the bubble desorption and mass transfer enhancement effects were decoupled based on an anodizing system with focused ultrasound, such that the dual effects of ultrasound on different targets were distinguished. The results showed that ultrasound has the dual effects on AAO fabrication. Specifically, ultrasound focused on the anode has a nanopore-expansion effect on AAO, leading to a 12.24 % improvement in fabrication efficiency. This was attributed to the promotion of interfacial ion migration through ultrasonic-induced high-frequency vibrational bubble desorption. However, AAO nanopores were observed to shrink when ultrasound was focused on the electrolyte, accompanied by a 25.85 % reduction in fabrication efficiency. The effects of ultrasound on mass transfer through jet cavitation appeared to be the reason for this phenomenon. This study resolved the paradoxical phenomena of UAA in previous studies and is expected to guide AAO application in electrochemistry and surface treatments. 相似文献
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Luminescence properties of anodic aluminum oxide films with organic luminophores embedded into pores
V. V. Gruzinskii A. V. Kukhto A. M. Mozalev V. F. Surganov 《Journal of Applied Spectroscopy》1997,64(4):497-502
Luminescence properties of porous anodic aluminum oxide films formed in a 0.6 M solution of citric acid and luminescence of
paraterphenyl, perylene, coumarin 7, and rhodamine 6G dyes adsorbed by the films are investigated. The nature of emitting
centers in anodic aluminum oxide is revealed. Intense photoluminescence of all tested dyes embedded into pores of anodic aluminum
oxide has been found. A redshift of fluorescence spectra of dyes adsorbed by the matrix and emergence of an additional longwave
band have been detected. Data obtained can be used in developing new thin-film luminescent coatings for future applications
in optoelectronics and molecular electronics.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No 4, pp. 483–488, July–August, 1997. 相似文献